Priority Mail Express International postage refund requests are processed under DMM 604. The mailer must complete Part I of PS Form 3533 in duplicate and submit it, along with the original customer copy of the mailing label (Label 11–B, Express Mail Post Office to Addressee), to any Post Office facility. Refund requests for Priority Mail Express International With Guarantee service are processed when a customer submits PS Form 3533–GE with appropriate documentation (see 942.2) to: